WO1996003221A1 - Procede de production et de refection de peintures multicouche permettant d'obtenir des effets multicolores - Google Patents

Procede de production et de refection de peintures multicouche permettant d'obtenir des effets multicolores Download PDF

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Publication number
WO1996003221A1
WO1996003221A1 PCT/EP1995/002749 EP9502749W WO9603221A1 WO 1996003221 A1 WO1996003221 A1 WO 1996003221A1 EP 9502749 W EP9502749 W EP 9502749W WO 9603221 A1 WO9603221 A1 WO 9603221A1
Authority
WO
WIPO (PCT)
Prior art keywords
paint
speed
shearing
measuring point
apparent viscosity
Prior art date
Application number
PCT/EP1995/002749
Other languages
German (de)
English (en)
Inventor
Heinz TÖPFEL
Ewald Bischoff
Harry Libutzki
Jorge Wellmann
Dieter Herbst
Hans-Joachim Streitberger
Original Assignee
Basf Lacke + Farben Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Basf Lacke + Farben Ag filed Critical Basf Lacke + Farben Ag
Priority to DE59503723T priority Critical patent/DE59503723D1/de
Priority to DK95925869T priority patent/DK0773840T3/da
Priority to US08/765,982 priority patent/US5820986A/en
Priority to KR1019970700415A priority patent/KR100208908B1/ko
Priority to JP8505415A priority patent/JP2891778B2/ja
Priority to EP95925869A priority patent/EP0773840B1/fr
Priority to CA002191879A priority patent/CA2191879A1/fr
Publication of WO1996003221A1 publication Critical patent/WO1996003221A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/067—Metallic effect
    • B05D5/068—Metallic effect achieved by multilayers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]

Definitions

  • the invention relates to a process for the production and repair of multilayer effect coatings and coated substrates which can be produced by this process.
  • a base coat layer is produced on a substrate surface using a paint containing at least one platelet-shaped pigment
  • the basecoat is overcoated with a transparent lacquer
  • lacquers containing aluminum plates are used as lacquers containing platelet-shaped pigments for the production of the base lacquer layer, then the widespread metallic effect lacquers are obtained, for example.
  • Both the basecoat layer can be touched up with a transparent lacquer or the baked multi-layer lacquer coating with a lacquer containing at least one pigment in the form of a plate, in the latter case Case is overpainted again with a transparent lacquer and then baked again. It is very important that the repaired areas on the finished paintwork are not recognizable by differences in color and brightness.
  • At least the last spraying step for the production of the basecoat film is carried out with the aid of a pneumatic application process in the case of automotive serial painting.
  • Pneumatic application methods are, however, disadvantageously characterized in that a relatively large part of the sprayed amount of paint does not reach the substrate, with the result that the circulating air in the spray booth must have high speeds so that the relatively large amounts of overspray are separated and disposed of can be.
  • the technical object on which the present invention is based is to provide a method for producing and repairing multi-layer effect coatings, in which
  • a base lacquer layer is produced on a substrate surface using a lacquer containing at least one platelet-shaped pigment
  • this base lacquer layer is optionally repaired by spraying on a lacquer containing at least one platelet-shaped pigment
  • the burned-in multilayer coating is optionally repaired by spraying on a coating containing at least one platelet-shaped pigment
  • (i) used is a varnish in stage (1) at a solids content of 18 wt.% and at a temperature of 23 * C at a Schergeschwindig ⁇ speed of 1000 s "1 after a shear period of 6 s has an apparent viscosity from 40 to 200, preferably 60 to 150 mPa s, after a shear time of 300 s at a shear rate of 1000 s _1 an apparent viscosity of 40 to 200, preferably 60 to 150 mPa s, at a shear rate of 5 s " 1 after a shear time of 10 s, an apparent viscosity of 100 to 2000, preferably 200 to 800 mPa s and after a shear time of 300 s with a shear speed of 5 s -1 has an apparent viscosity of 100 to 2000, preferably 500 to 1500 mPa s, the measurements carried out at the shear rate of 5 sec " 1 immediately after a 300 s duration at a shear rate of 1000 s
  • step (1) the basecoat layer produced in step (1) is produced exclusively by electrostatic spraying and
  • the paint drops have a speed which is below 6 m / s, and at most 30, preferably 0 to 20% of the paint drops which pass this measuring point have a speed of more than 10 m / s and
  • the paint drops passing a measuring point which is in the center of the spray jet and 300 mm from the nozzle have an impulse which is at least 4 x 10 ⁇ 5 , preferably 6 x
  • the diameter and the speed of the paint drops were determined using the phase Doppler anemometry method.
  • the basecoat film is produced, preferably in only one spraying step, exclusively by electrostatic spraying.
  • electrostatic spraying the amount of the sprayed coating material which reaches the substrate is considerably larger than in the case of pneumatic application processes. The consequence of this is that the speed of the circulating air in the spray booth can be reduced and that smaller amounts of paint overspray have to be worked up and disposed of.
  • the painting installation required for the production of multilayer effect paints can be considerably reduced if the basecoat film can be produced in just one spray pass.
  • step (1) of the process according to the invention all of the platelet-shaped pigments containing platelet-shaped pigments suitable for the serial painting of automobile bodies can be used, provided they have a solids content of 18% by weight and a temperature of 23 ° C. at a shear rate of 1,000 s _1 after a shear time of 6 s an apparent viscosity of 40 to 200, preferably 60 to 150 mPa s, after a shear time of 300 s at a shear rate of 1000 s " 1 an apparent viscosity of 40 to 200, preferably 60 to 150 mPa s, at a shear rate of 5 s _1 after an shear time of 10 s an apparent viscosity of 100 to 2000, preferably 200 to 800 mPa s and after a shear time of 300 s at a shear rate of 5 s " 1 has an apparent viscosity of 100 to 2000, preferably 500 to 1500 mPa s, the measurements carried out at the shear rate of
  • rheology aids such as, for example, crosslinked polymer microparticles (cf. for example EP-A-38127), finely divided silica, anionic polyacrylate resins, layered silicates, etc.
  • the person skilled in the art can, in principle, use any of the series ⁇ painting suitable basecoat on a viscosity hold that meets the above conditions.
  • the basecoats used in stage (1) of the process according to the invention can be either aqueous or non-aqueous.
  • platelet-shaped pigments in particular aluminum pigments and / or pearlescent pigments containing basecoats suitable for the serial painting of automobiles, have been known for a long time and are commercially available in a large number of different embodiments, a detailed description is not necessary here.
  • Aqueous basecoats are described, for example, in EP-A-38127 and non-aqueous basecoats are described, for example, in US-A-4,220,679.
  • the process according to the invention is particularly well suited for the production and repair of multi-layer effect coatings with darker shades (e.g. diamond black) and for the production and repair of multi-layer effect coatings with lighter shades (e.g. silver).
  • darker shades e.g. diamond black
  • lighter shades e.g. silver
  • the basecoat layer produced in stage (1) is produced exclusively by electrostatic spraying.
  • electrostatic spraying the amount of the sprayed coating material which reaches the substrate is considerably larger than in the case of pneumatic application processes. The consequence of this is that the speed of the circulating air in the spray booth can be reduced and that smaller amounts of paint overspray have to be worked up and disposed of.
  • the painting installation required for the production of multi-layer effect lacquers can be considerably reduced if the base lacquer layer is produced exclusively by electrostatic spraying.
  • the application of basecoats containing platelet-shaped pigments electrostatic spraying is well known to the person skilled in the art and therefore does not need to be explained in more detail here
  • stage (2) or stage (5) is carried out with the aid of a spray application method in which a spray jet consisting of paint drops is produced, which is characterized in that
  • the paint drops passing a measuring point which is in the center of the spray jet and 300 m from the nozzle, have an impulse that is at least 4 x 10 "" 5 , preferably 6 x 10 ⁇ 5 to 8 x 10 ⁇ 5 g cm s _1 amounts to
  • Spray application processes in which the paint drops in the spray jet correspond to the abovementioned conditions can be carried out, for example, using HVLP (high volume, low pressure) spray guns which are commercially available.
  • the diameter, the speed and thus also the momentum of the paint drops in the spray jet essentially depend on the paint outflow rate, the atomizing air quantity or atomizing air pressure, the paint viscosity and the nozzle geometry.
  • a reduction in the paint outflow rate results, for example, in a reduction in the paint drop diameter and in an increase in the speed of the paint drop.
  • An increase in the atomizing air pressure also leads to a reduction in the paint drop diameter and to an increase in the speed of the paint drop.
  • phase Doppler anemometry method is used by WD Bachalo and MJ Houser in OPTICAL ENGINEERING / September / October 1984 / Vol.23 No.5 on pages 583 to 590.
  • a commercially available, aqueous basecoat containing polyester resin, polyurethane resin, melamine resin and aluminum pigments (FW 54-7690, BASF Lacke und Wegner AG) with a solids content of 24% by weight and the following at 23 ° C. with a rotary viscometer (Viscolab from Physika ) determined rheological data:
  • the basecoat film thus obtained is overcoated with a commercially available clearcoat containing a polyacrylate resin as binder and a melamine resin as crosslinking agent (dry film thickness of the clearcoat layer: 50 ⁇ m), and then basecoat and clear varnish baked at 140 * C for 20 minutes.
  • half of the coated test board is taped with an adhesive strip and the remaining half is sanded with abrasive paper (800) using a damp cloth. Then the basecoat used for the initial painting is applied with an HVLP spray gun (De Vilbiss GFHV-511, manufacturer: De Vilbiss; cap: air cap No. 152, nozzle EY 7; atomization pressure: 0.4 bar, measured at air cap; spraying distance: 30 cm to Substrate) sprayed in a first application (first cloister) in a dry layer thickness of 6-8 ⁇ m.
  • HVLP spray gun De Vilbiss GFHV-511, manufacturer: De Vilbiss; cap: air cap No. 152, nozzle EY 7; atomization pressure: 0.4 bar, measured at air cap; spraying distance: 30 cm to Substrate
  • the resulting spray jet is characterized by the fact that 25% of the one measuring point in the center of the spray And 300 mm from the nozzle, passing paint drops have a diameter that is less than 20 ⁇ m and 15% of the paint drops that pass this measuring point have a diameter that is more than 60 ⁇ m. In addition, 33% of the drops of paint passing the measuring point have a speed which is below 6 m / s, and 17% of the drops of paint which pass the measuring point have a speed of more than 10 m / s.
  • the momentum of the coating droplets passing through the measuring point is 6.8 * 10 -5 g cm s' 1.
  • the diameter and the speed of the coating droplets were of the phase-Doppler anemometry method determined by.
  • the basecoat used for the first coat is sprayed again with the LPHV spray gun under the conditions described above in a dry layer thickness of 6-8 ⁇ m (second cross coat).
  • the basecoat film thus obtained is overcoated with a commercially available clearcoat containing a polyacrylate resin as binder and a polyisocyanate as crosslinking agent (dry film thickness of the clearcoat layer: 45 ⁇ m) and then basecoat and clearcoat are baked at 140 "C for 30 min.
  • a commercially available clearcoat containing a polyacrylate resin as binder and a polyisocyanate as crosslinking agent (dry film thickness of the clearcoat layer: 45 ⁇ m) and then basecoat and clearcoat are baked at 140 "C for 30 min.
  • the adhesive strip covering one half of the first coat of paint is removed and the first coat of paint is compared with the touch-up paint. Neither hue nor differences in brightness are discernible.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne un procédé de production et de réfection de peintures multicouche à effets multicolores, selon lequel la couche de base est appliquée uniquement par pulvérisation électrostatique. La peinture de base utilisée présente un comportement rhéologique déterminé et la réfection s'effectue par application par pulvérisation, procédé selon lequel un jet de pulvérisation est produit et se caractérise en ce que - au plus 40 % des gouttelettes de peinture passant par un point de mesure situé au centre du jet de pulvérisation et à 300 mm de l'ajutage présentent un diamètre inférieur à 20 νm et qu'au moins 5 % des gouttelettes de peinture présentent un diamètre supérieur à 60 νm, - au moins 20 % des gouttelettes de peinture qui passent par le point de mesure progressent à une vitesse inférieure à 6 m/s, et qu'au plus 30 % des gouttelettes de peinture progressent à une vitesse de plus de 10 m/s et que - les gouttelettes de peinture ont une impulsion s'élevant au moins à 4 x 10?-5 g cm s-1¿, le diamètre et la vitesse étant déterminés à l'aide de la méthode par anémométrie à effet Doppler de phase.
PCT/EP1995/002749 1994-07-22 1995-07-13 Procede de production et de refection de peintures multicouche permettant d'obtenir des effets multicolores WO1996003221A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE59503723T DE59503723D1 (de) 1994-07-22 1995-07-13 Verfahren zur herstellung und ausbesserung von mehrschichtigen effektlackierungen
DK95925869T DK0773840T3 (da) 1994-07-22 1995-07-13 Fremgangsmåde til fremstilling og udbedring af flerlagede effektlakeringer
US08/765,982 US5820986A (en) 1994-07-22 1995-07-13 Method for the production and repair of multicoat special-effect coatings
KR1019970700415A KR100208908B1 (ko) 1994-07-22 1995-07-13 다중피복의특수효과를갖는피복물을제조하고복구시키는방법
JP8505415A JP2891778B2 (ja) 1994-07-22 1995-07-13 多層効果塗膜の製造及び修復方法
EP95925869A EP0773840B1 (fr) 1994-07-22 1995-07-13 Procede de production et de refection de peintures multicouche permettant d'obtenir des effets multicolores
CA002191879A CA2191879A1 (fr) 1994-07-22 1995-07-13 Procede de production et de refection de peintures multicouche permettant d'obtenir des effets multicolores

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4426039.3 1994-07-22
DE4426039A DE4426039A1 (de) 1994-07-22 1994-07-22 Verfahren zur Herstellung und Ausbesserung von mehrschichtigen Effektlackierungen

Publications (1)

Publication Number Publication Date
WO1996003221A1 true WO1996003221A1 (fr) 1996-02-08

Family

ID=6523917

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/002749 WO1996003221A1 (fr) 1994-07-22 1995-07-13 Procede de production et de refection de peintures multicouche permettant d'obtenir des effets multicolores

Country Status (12)

Country Link
US (1) US5820986A (fr)
EP (1) EP0773840B1 (fr)
JP (1) JP2891778B2 (fr)
KR (1) KR100208908B1 (fr)
CN (1) CN1152886A (fr)
AT (1) ATE171399T1 (fr)
CA (1) CA2191879A1 (fr)
DE (2) DE4426039A1 (fr)
DK (1) DK0773840T3 (fr)
ES (1) ES2125029T3 (fr)
TW (1) TW400255B (fr)
WO (1) WO1996003221A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9744559B2 (en) 2014-05-27 2017-08-29 Paul W Harrison High contrast surface marking using nanoparticle materials

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50111955D1 (de) * 2000-03-16 2007-03-15 Volkswagen Ag Verfahren zur kleinflächigen beseitigung von lackierungsfehlern
DE60110492T2 (de) * 2000-04-17 2006-02-23 E.I. Du Pont De Nemours And Co., Wilmington Verfahren zur Reparaturbeschichtung von Mehrschichtüberzügen auf Substraten
US6777033B2 (en) 2002-03-18 2004-08-17 E. I. Du Pont De Nemours And Company Process for refinishing substrates
CN106423805A (zh) * 2016-11-28 2017-02-22 中信戴卡股份有限公司 一种铝合金表面涂层及形成该涂层的方法
WO2020002252A1 (fr) * 2018-06-25 2020-01-02 Basf Coatings Gmbh Procédé pour réaliser un revêtement optimisé et revêtement pouvant être obtenu au moyen dudit procédé
EP3811051A1 (fr) * 2018-06-25 2021-04-28 BASF Coatings GmbH Procédé pour déterminer la distribution des dimensions de gouttelettes pendant la pulvérisation et procédé de sélection fondé sur ladite distribution des dimensions de gouttelettes lors de la mise au point de peintures

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038127A1 (fr) * 1980-04-14 1981-10-21 Imperial Chemical Industries Plc Procédé pour enduire en plusieurs couches, comprenant l'utilisation d'une composition aqueuse à caractère thixotropique d'enduit de fond contenant des particules d'un polymère réticulé
EP0402181A1 (fr) * 1989-06-12 1990-12-12 Nissan Motor Co., Ltd. Méthode pour former un film de vernis du type "Japon"
EP0402772A1 (fr) * 1989-06-10 1990-12-19 Hoechst Aktiengesellschaft Matériau de revêtement, procédé de préparation de revêtements et objets recouverts par ce matériau

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JPS5814266B2 (ja) * 1975-12-19 1983-03-18 三井東圧化学株式会社 メタリツクチヨウトマクノケイセイホウホウ
US4238387A (en) * 1978-11-20 1980-12-09 E. I. Du Pont De Nemours And Company Rheology control additive for paints
US4477536A (en) * 1982-03-18 1984-10-16 Glasurit America, Inc. Process for preparing a multilayer coating
NL8500475A (nl) * 1985-02-20 1986-09-16 Akzo Nv Thixotrope bekledingssamenstelling.
US5204401A (en) * 1990-07-13 1993-04-20 Basf Corporation Metallic water borne base coat composition based on acrylic latex resins using acrylic resins derived from vinyl monomers having nonionic and urethane functionality for aluminum storage and a treated hextorie clay for rheology control - water base 9
US5413809A (en) * 1993-07-01 1995-05-09 E. I. Du Pont De Nemours And Company Method for achieving recoat adhesion over a silane topcoat
JP3208022B2 (ja) * 1994-10-21 2001-09-10 本田技研工業株式会社 メタリック塗料の塗装方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038127A1 (fr) * 1980-04-14 1981-10-21 Imperial Chemical Industries Plc Procédé pour enduire en plusieurs couches, comprenant l'utilisation d'une composition aqueuse à caractère thixotropique d'enduit de fond contenant des particules d'un polymère réticulé
EP0402772A1 (fr) * 1989-06-10 1990-12-19 Hoechst Aktiengesellschaft Matériau de revêtement, procédé de préparation de revêtements et objets recouverts par ce matériau
EP0402181A1 (fr) * 1989-06-12 1990-12-12 Nissan Motor Co., Ltd. Méthode pour former un film de vernis du type "Japon"

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9744559B2 (en) 2014-05-27 2017-08-29 Paul W Harrison High contrast surface marking using nanoparticle materials

Also Published As

Publication number Publication date
ES2125029T3 (es) 1999-02-16
DK0773840T3 (da) 1999-06-14
EP0773840B1 (fr) 1998-09-23
DE59503723D1 (de) 1998-10-29
JP2891778B2 (ja) 1999-05-17
JPH09509098A (ja) 1997-09-16
KR970704525A (ko) 1997-09-06
ATE171399T1 (de) 1998-10-15
TW400255B (en) 2000-08-01
EP0773840A1 (fr) 1997-05-21
CN1152886A (zh) 1997-06-25
US5820986A (en) 1998-10-13
DE4426039A1 (de) 1996-01-25
CA2191879A1 (fr) 1996-02-08
KR100208908B1 (ko) 1999-07-15

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